package com.itheima.filter;

import com.itheima.utils.JwtUtils;
import io.jsonwebtoken.Jwt;
import jakarta.servlet.*;
import jakarta.servlet.annotation.WebFilter;
import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse;
import lombok.extern.slf4j.Slf4j;

import java.io.IOException;

/**
 * @author 何景航
 * @date 2025/11/1 8:54
 */
@Slf4j
//@WebFilter(urlPatterns = "/*")
public class TokenFilter implements Filter {

    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        HttpServletRequest request = (HttpServletRequest) servletRequest;
        HttpServletResponse response = (HttpServletResponse) servletResponse;

        //1.获取到请求路径
        String requestURI = request.getRequestURI();

        //2.判断是否为登录请求
        if(requestURI.contains("/login")){
            filterChain.doFilter(request, response);
            return;
        }

        //3.获取请求头中的token
        String token = request.getHeader("token");

        //4.判断token是否为空,如果为空，返回401
        if(token == null || token.isEmpty()){
            log.info("令牌为空，响应401");
            response.setStatus(HttpServletResponse.SC_UNAUTHORIZED);
            return;
        }

        //5.判断token是否正确,(解析token)
        try {
            JwtUtils.parserToken( token);
        } catch (Exception e) {
            log.info("令牌非法，响应401");
            response.setStatus(HttpServletResponse.SC_UNAUTHORIZED);
            return;
        }

        //校验通过，放行
        log.info("令牌合法，放行");
        filterChain.doFilter(request, response);
    }
}
